Apparatus for drilling and reaming and countersinking



Cw N K N s R E T N u 0 c D N 0A V E LII ZM TA L A 8 N F G 0N IL I. D ah 0 F. s U A R A P D.- A

APPLICATION FILED MAR. 5, 1920.

Patented Dec. 21, 1920.

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0 1222 1 ,Baltile yr J M. dnZ/L oi Hagerstown, vented certain new and useful Improvements the cylinder and its onirr n stares smear orrics.

CHEN F. BAL'I'ZLEY, 0F HAGERSTOV/N, MARYLAJTD, ASSIGNOR TO THE LIBERTY TOOL COMPANY, OF'IBALTIIVIORIE, IIIAREZ'LAND, A CORI ORATIGN OF MARYLAND.

T 0 all whom it may concern:

Be it known that I, ORnN F. BALTZLEY, a citizen of the United States, and resident State of lviaryland, have inin Apparatus for Drilling and Beaming and ountersinkii'ig, of which the following is a specification.

My invention is an improvement upon portable apparatus for drilling, reaming, or countersinking and one object of the invention is to provide such an arrangement and construction of parts as will give large capacity to the machine by enabling it to be used in situations where machines as here tofore constructed could not be employed and is a divisional application of my copending application 287,259, now Patent #1,352,646. 7

A prior form of portable machine is that shown in the United States patent of Diffendall No. which a cutting tool and I ried by a bracket or support mounted on a frame member or bar which has fixed thereon at its end a cylinder in which works a piston forming a work feeding or holding device to feed the work relative to the frame bar or member and the cutting device carried thereby, when said piston is operated by fluid pressure let into the cylinder.

An objection exists to this cylinder and piston arranged at the end of the frame and beyond the point where the work is done.

ere are work pieces of such form or of such location relative to other parts of the structure with which they are associated that piston cannot be fitted to because of lack of space.

I therefore dispense with the cylinder and piston at the end of the main frame member or bar and instead I provide a feed foot or what is called in the trade a crow-foot fixed to the frame member or bar to engage and hold or feed the work piece. This frame member or bar and the tool are relatively movable, the frame member and the tool carrier having a sliding connection with each other. The relative movement is effected by a cylinder and piston operated by fluid pressure, the piston being connected to one of the said parts, 2'. e., either the main frame Specification of Letters Patent.

Patented Dec. 21, 1920. Divided and this application filed March 5,

Serial No. 363,525.

member or the tool carrier and the cylinder be ng connected to the other so that when the fluid pressure is on there will be a relative tool, if the latter is held at one position, or in case the work bar, and not acting on the work piece directly so that both the cylinder and piston can be located apart from the point where the work piece is to be held or fed.

This crow-foot placed and thus the machine has a wider range of use than machines of the prior form.

The invention consists in combina ion and arrangement of parts hereinafter described out in the claims.

The drawing is a side view of a drilling machine embodying the invention.

In this drawing the bar or frame member is shown at 2', having the feed foot 72 mounted thereon, its immediate support being a bolt p adjustable in a vertical slot p of a bracket clamped to the bar by a bolt form of a fork to permit the passage of the drilling tool.

The motor indicated in dotted lines at b is supported at one'end upon a bolt or stem 0, having a threaded end to engage a suitable portion of the motor casing. The bolt has a hand wheel d by which it may be turned. The bolt is mounted in the arm e of a f or bracket lying to one side of the axis of the motor, the frame being slidably mounted on the carrier bar 2'.

2' with the feed foot p are moved relative to a each other by a cylinder 70 and piston is.

The cylinder is connected to the bar a rigidly though adjustable thereon and the piston is rigidly connected to the bracket 6 by its piston rod 76 The pressure fluid is introduced into the cylinder by a conduit 70 through the piston rod 70 from an inlet 70 The piston and cylinder will give relative movement to the carrying bar a and the bracket 6 in either direction for advancing the drill to and through the work piece w or for withdrawing it.

A clamp Q may be used for clamping the work piece between itself and the feed foot, 1 2 his clamp is adjustable on the bar 7' and may be set in any position by the clamp bolt g operated by a suitable handle. At r isshown a stop which may be fixed to the bar 2' in different positions to limit the depth to which thedrill will penetrate the work piece.

The whole apparatus is portable. The cylinder and piston arrangement Z0 70* is on the same side of the frame bar as the bracket 6 and is on the opposite side of said bracket from the point at which the feed foot is located. The arrangement of parts is such that the apparatus is of minimum width and is susceptible of use in close situations.

I claim 1. A. portable drilling apparatus comprising a bar, a feed foot attached thereto, a bracket slidable relative to the bar and carried thereby, a motor and tool mounted in the bracket, a piston and cylinder arranged at the opposite side of the bracket from where the feed foot is located, one of said parts being connected with the bracket and the other with the carrying bar and means for introducing pressure fluid into the cylinder, substantially as described.

2. A portable drilling apparatus comprising a bar, a feed foot attached thereto, a bracket slidable relative to the bar and carried thereby a motor and tool mounted in the bracket, a piston and cylinder arranged at the opposite side of the bracket from where the vteed foot is located, said piston having its rod connected with the bracket and the cylinder mounted fixedly on the said rod, substantially as described.

8. A portable drilling apparatusicomprising a bar, a feed toot attached thereto, a bracket slidable relative to the bar and carried thereby, a motor and tool mounted in the bracket, a piston and cylinder arranged at the opposite side of the bracket irom where the feed foot is located, one of said parts being connected with the bracket and the other with the carrying bar and means for introducing pressure fluid into the cylinder, both the piston and cylinder being on the same side of the rod as the bracket, substantially as described. a

In testimony whereof I affix my signature.

OREN F. BALTZLEY. 

